I concluded that I can no longer tolerate the errors and inconsistences in the current tank monitoring system. After reading through the many threads on this I believe that I will be able to install the 712 TT SeeLevel System with brand new wiring and at least one new location for one of the panels. I'll just leave the old units in place.

However, I saw no mention of where anyone installed the outside thermometer. The manuals state not to put them where road grime will cover them up. There is no mention of how big these units are. Obviously a wire needs to be run to the units which should theoretically be mounted in the shade.

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I have one of those in my coach. The temperature sensor isn't that large - probably 3/4" x 2" at the most. It is gooked up so that it can take some water. In my case I already have an outside temperature probe so I didn't really need nother. What I did do is mount it to the wall of the basement compartment where the sewer and water stuff is. That way I can tell if it's getting too cold and might freeze down there.

If you want to use it as an outside temp thing just keep it away from hot spots. On my old Suncruiser I had it behind the grill but whenever I stopped moving the radiator heated it up. I now have my outside temp probe right underneath the front cap. It gets clean air flow when driving and is also accurate when parked. The only time it isn't is when I run the generator, which heats up that area.